Zygosis

noun

1. The union of gametes to form a zygote; conjugation.
2. Asexual intercourse of protoplasmic bodies, resulting in their confluence and coalescence; the process and result of conjugation in protozoans or other of the lowest organisms. See conjugation, 4.
3. [capitalized] [NL. (Förster, 1869).] A genus of hymenopterous insects.
4. In botany, conjugation; the fusion or union of two distinct cells or protoplasmic masses for reproduction. See conjugation, 4.
5. The process of the merging of two gametes. Same as conjugation.